MULTIQUIP LS450 - Lubrication Box and Accumulator; Cylinder Lubrication Box; Accumulator Circuit

MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21) — PAGE 49
CYLINDER LUBRICATION BOX
1. The lubrication level should be checked every day prior
to pumping and maintained at a height of 5 inches, or
about 1/2 the concrete cylinder height. We recommend
using a 30-weight motor oil.
2. As the rubber piston cups naturally wear, fine cement
particles will accumulate in the box. Once the concrete
paste reaches a height of about 1/2 inch from the
bottom of the box, drain and clean the lubrication box.
Cleaning the Lubrication Box
1. Remove the top cover and the drain plug (Figure 55)
located at the bottom of the box, and fully drain the
inside of the box.
2. Once the box is drained, start the engine and stroke the
cylinder (keeping hands out of the box) 10 to 15 times.
3. While stroking, spray water inside the box (Figure 55)
to thoroughly clean out all contamination.
4. When the box is clean, replace the drain plug, add new
lubrication and install the top cover.
Figure 55. Cleaning the Lubrication Box
NOTICE
When using the pump during freezing conditions,
completely drain the lubrication box and cover the
hopper after pumping. Frozen liquid will restrict the
piston travel and cause severe damage to the pump.
WARNING
ALWAYS follow lockout/tagout procedures before
checking the lubrication level. Stop the engine and
remove the engine starter key. The possibility exists of
severe bodily harm when hands are placed inside.
DRAIN
PLUG
TOP
COVER
W
A
T
E
R
MAINTENANCE
ACCUMULATOR CIRCUIT
The accumulator circuit has two functions within the
hydraulic system:
 The accumulator circuit furnishes the hydraulic pressure
to cycle the shuttle tube.
 The accumulator circuit also furnishes the pilot pressure
necessary to activate the hydraulic system.
The accumulator circuit is equipped with a bladder-type
accumulator (Figure 56) pre-charged with 1,100 psi of dry
nitrogen. The accumulator stores one gallon of hydraulic
oil which is under 1,750 psi of pressure.
Figure 56. Accumulator
When the pump cycles, a portion of the stored oil is
released to the shuttle cylinder. This released oil pressure
ensures that the shuttle tube has enough force to shear the
cylinder of concrete passing from the concrete cylinder to
the concrete delivery line during the cycle phase.
DANGER
Improper accumulator charging
can result in an explosion
causing serious injury or
DEATH! NEVER use oxygen
or compressed air to charge
the accumulator! Only qualified
personnel should perform this procedure. Use only
dry nitrogen to charge the accumulator. Contact
your Mayco service department or your local Hydac
representative for proper charging procedure.